[Q] SMS apps questions

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http://forum.xda-developers.com – I've been looking at alternative SMS apps because I wanted to get rid of the MMS showing as slideshows and it looks like the only one doing it properly (displaying the image and text inside the conversation view) is SMSdroid, which doesn't have many other functionalities. Is there another SMS app doing that? I tried GOsms, Handcent and ChompSMS but I could have missed their option to do so. Another question I have is why so many SMS apps run a service constantly while some don't and still receive incoming SMS? I try to keep as few services running in the background as possible to save batte (HowTos)